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#1 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Big Block Fuel line / Filter Pics at Carb?
Well After Mounting my Fuel Filter behind the mechanical pump and running into fuel starving / Vapor lock issues. (which I knew what the problem was caused from thanks to a previous post by Longhorn Man) I am Shopping around for Replacments after the pump. I would like something that looks good since I am trying to clean u[p the engine compartment, as well as works so here are a few pics and questions.
I have a q-jet does that take 3/8 or 5/16 npt? Is the outlet on the fuel pump (stock mechanical) 3/8 npt Should I remopved the q-jet incarb filter if I am going to run another one. As always the help is apreceated. What I want is something like this.
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#2 |
Senior Member
Join Date: Nov 2000
Location: WI,USA
Posts: 495
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Re: Big Block Fuel line / Filter Pics at Carb?
Pics?
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69 Lwb C-10 402/700R4 70 Lwb C-10 250/3pd Wisc. |
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#3 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
This is what I would like (not sure why it didn't post the first time.)
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#4 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
not sure if I can connect a fuel filter with this setup
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB Last edited by So.Cal.Super; 08-19-2008 at 06:30 PM. |
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#5 |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Big Block Fuel line / Filter Pics at Carb?
ahaha, i JUST went through this. My setup is a fuel filter BEFORE the fuel pump, and there is a mini filter INSIDE the qjet. I went and bought some hardline from napa with the fittings on the ends and just bent them how i wanted em... Nice hardlines... It was 6 bucks for the hardline with the fittings. THey are 3/8 fittings on the end on the pump and carb by the way...
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#6 |
its all about the +6 inches
Join Date: Jan 2001
Location: Hilliard Ohio
Posts: 2,693
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Re: Big Block Fuel line / Filter Pics at Carb?
it's not a good idea to put the filter before the pump. It reduces the pressure more than it has to be (it's already at negative pressure as compaired to atmosphere pressure) and the more you drop the pressure, the lower the boiling point is... which can cause, or agrivate vapor lock conditions.
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#7 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
Yup, I Learned this from LHM After I installed mine before the pump and it caused problems between second and third at W/O throttle and it may be the cause of another problem I am having while slowing down which is why I am on this mission.
(pic1) current filter (pic2) current fuel line I want to replace.
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#8 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
ttt
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#9 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: Big Block Fuel line / Filter Pics at Carb?
I cut the metal fuel-line as it comes up from the fuel pump just in front of the passenger-side head and installed a metal in-line filter. I also took the small filter out of the carburator.
I did it a couple years ago and it is working fine. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#10 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Big Block Fuel line / Filter Pics at Carb?
Quote:
My 71 has the filter located before the fuel pump. Same with the 81 i bought.... |
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#11 |
Junior Member
Join Date: Dec 2006
Location: Southeast Missouri
Posts: 2,436
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Re: Big Block Fuel line / Filter Pics at Carb?
That is a good question.
It probably would have been fine to put a new small filter in the carb, but to me the pumice type filter looked to be awful restrictive. I think it was back in '76 I did the same thing on my '72 GMC and it worked great so I figured it would too on my '71 Chevy. Danny
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'67 Chevy C-20 short stepper - build complete, 454/SM-465. '75 C-30 Single Cab DRW-350 small block/NP-435. '77 GMC-6500 Dump Truck, 427 Tall Deck. '92 GMC K-3500 Duallie, 454/4L80E. |
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#12 | |
PITbut
Join Date: Sep 2007
Location: monroe washington
Posts: 3,052
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Re: Big Block Fuel line / Filter Pics at Carb?
Quote:
SO the consensus is filter AFTER the fuel pump??? Now im wondering if i should take my filter outta my carb. ahaha |
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#13 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
I thought it might not be good to double filter. Sounds like it works ok with it out.
thanks.
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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#14 |
Senior Member
Join Date: Sep 2004
Location: Terrell, TX
Posts: 1,967
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Re: Big Block Fuel line / Filter Pics at Carb?
You are right. Had a buddy once with a BB that didn't run like we thought it might...the culprit...7 fuel filters. Yep you read that right. I'd never heard of using more than one and now I know why.
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Kelly '05 GMC Sierra SLE Z71 Bone stock except for new bed rail caps. |
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#15 |
67-72 parts collector,…
![]() Join Date: Nov 2002
Location: Mid-MO
Posts: 22,699
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Re: Big Block Fuel line / Filter Pics at Carb?
On my blazer I run an inline metal filter BEFORE the mechanical fuel pump and a 3/8" steel line all the way to the carb. Factory Q-jet filter was removed. It's been working fine for 4 years.
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Keith Convert to disc brakes. http://67-72chevytrucks.com/vboard/s...d.php?t=444823 |
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#16 |
just can't cover up my redneck
Join Date: May 2004
Location: Columbus OH
Posts: 11,414
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Re: Big Block Fuel line / Filter Pics at Carb?
The general "rule of thumb" is the you run a filter after a mechanical pump.
You run a filter before an electric pump, which should be mounted as close to the tank as possible. |
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#17 |
18 Till I Die
Join Date: Mar 2005
Location: Alberta, Canada
Posts: 1,522
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Re: Big Block Fuel line / Filter Pics at Carb?
Mines an electric setup if that helps or not heres some pics
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#18 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
I would bet it has to do with the style of filter and how much it filters for restriction purposes. Mine Idols great and under normal driving runs ok. But, at wide open Throttle after second gear the engine starts to bog down from vapor lock. I even have a carter mechanical which flows a bit more then stock. If I had an electric (like Kelsfine69, nice setup btw) I'm sure it would be fine. I just don't want to go that route right now.
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB Last edited by So.Cal.Super; 08-24-2008 at 11:32 AM. |
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#19 |
"Trucks with Class"
![]() Join Date: Jul 2000
Location: OLYMPIA, WA, USA
Posts: 8,132
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Re: Big Block Fuel line / Filter Pics at Carb?
A BB definitely needs 3/8 fuel lines. I would get rid of all the 5/16s lines & small fittings.
Next I would get rid of all that rubber hose. Steel lines with open bends is better and steel braided with aircraft fittings is best. If you have a qjet, you can run the longer fuel inlet that uses a long filter for much better filtering & flow. |
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#20 |
It'll Buff Out!
![]() Join Date: Apr 2007
Location: San Diego
Posts: 603
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Re: Big Block Fuel line / Filter Pics at Carb?
Do you have a pic or sell them?
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"Instructions are just another mans opinion" Become a Supporting Member http://67-72chevytrucks.com/vboard/payments.php Man Card Rules http://67-72chevytrucks.com/vboard/s...d.php?t=634550 72 Chevy Cheyenne Super 400 LWB |
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